"The Messenger of Allah (ﷺ) said: 'If a dog licks the vessel of any one of you, let him throw (the contents) away and wash it seven times.'"
Sunan an-Nasa'i Book 2, Hadith 11
← Previous Hadith "The Messenger of Allah (ﷺ) would say: 'Allahummaghsil khatayaya bi-ma'ith-thalj wal-barad (O Allah, wash away my sins with the water of snow and hail).'"

That is at the beginning of Salah as is clear from the remainder of the narration which preceded under No. 60.

Sunan an-Nasa'i Book 2, Hadith 10 Next Hadith → "If a dog licks a vessel then wash it seven times and rub it the eighth time with dust."

Sunan an-Nasa'i Book 2, Hadith 12